A cyclic phosphate-based battery electrolyte for high voltage and safe operation
| Autor: | Qifeng Zheng, Yuki Yamada, Yun-Yang Lee, Atsuo Yamada, Eiichi Nakamura, Rui Shang, Seongjae Ko, Kijae Kim |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Phosphate Combustion 01 natural sciences Cathode 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention Solvent chemistry.chemical_compound Fuel Technology chemistry Chemical engineering law Carbonate Lithium 0210 nano-technology Ethylene carbonate |
| Zdroj: | Nature Energy. 5:291-298 |
| ISSN: | 2058-7546 |
| Popis: | The traditional electrolyte for lithium-ion batteries is a combination of 1 M LiPF6 with a cyclic carbonate-based solvent (for example, ethylene carbonate). The lack of a suitable alternative solvent has hindered further exploration of new functional electrolytes. Here we design and synthesize a fluorinated cyclic phosphate solvent, 2-(2,2,2-trifluoroethoxy)-1,3,2-dioxaphospholane 2-oxide (TFEP), for use in lithium-ion batteries. Our design rationale is that this solvent molecule has a fused chemical structure of cyclic carbonates that can form a stable solid electrolyte interphase and organic phosphates that can trap hydrogen radicals and prevent combustion. An electrolyte formula composed of 0.95 M LiN(SO2F)2 in TFEP/2,2,2-trifluoroethyl methyl carbonate shows excellent non-flammability with zero self-extinguishing time and enables the highly stable operation of graphite anodes (~0.1 V versus lithium) and high-voltage LiNi0.5Mn1.5O4 cathodes (~4.7 V versus lithium), and thereby outperforms traditional electrolytes. This work opens up new frontiers in electrolyte developments towards safe lithium-ion batteries with higher energy densities. Non-flammable high-performance electrolytes are in high demand for rechargeable batteries. Here the authors design cyclic phosphate-based electrolytes to enable stable operations of graphite anodes and high-voltage cathodes for lithium-ion batteries. |
| Databáze: | OpenAIRE |
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